End bracket for dynamo-electric machines



Aug. 12, 1930- w. LA VIGNA 1,772,836

END BRACKET FOR DYNAMQ ELECTRIC MACHINES Filed June 23, 1927 B SheetS-Sheejc 1 7 i E X I N VEN TOR.

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Aug. 12, 1930.

W. LA VIGNA END BRACKET FOR DYNAMO ELECTRIC MACHINES Filed June 25, 1927 2 Sheets-Sheet 2 Patented Aug. 12, 1930 UNITED STATES PATENT OFFICE WILLIAM LA VIGNA, OF UNIVERSITY HEIGHTS, OHIO, ASSIGNOR TO THE LINCOLN ELECTRIC COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF OHIO END BRACKET FOR DYNAMIC-ELECTRIC MACHINES Application filed June 23, 1927. Serial No. 200,842.

In motors and similar dynan'io-eleetric machines it has been generally customary heretofore to make the frames of cast iron. l his, in order to give proper strength, alloweuro. however, necessitates relatively thick sections and corrcspomlingly heavy weights, which vfor certain sizes of machines are open to objection. Moreover dillicultiesin securing ample space for ventilation complicate the matter of design. \Vhere attempts have been made to substitute stampings particularly for end elements supporting bearings, it has been found that stresses introduced in the stamping are prone to develop distortions resulting in misalignment of hearings and consequent trouble of added friction, etc. It is among the objects of the present invention to provide a construction which allows of adequate strength without undue weight or obstruction of ventilation. Other objects and advantages will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, the invention, then, consists of the means hereinafter fully described, and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail certain features embodying the invention, such disclosed means constituting however but one of various mechanical forms in which the principle of the invention may be applied.

In said annexed drawings Fig.1 is partly a side elevation and partly a central vertical section of a typical motor wherein my improved construction is incorporated; Fig. 2 is a plan view, with insert section to indicate its true shape, showing a blank employed in the construction; Fig. 3 is a perspective view of a detail; Fig. 4 is an ele ational view of the end bracket assembly; and Fig. 5 is a section taken on a plane corresponding to the line VV, Fig. 4.

The reference numeral 1 in the drawing designates a stator of usual laminated type having end rings 2, the detail of such end ring construction being as desired, but advantageously it may be along the lines set forth in Patents 1,629,876 and 1,629,877 of May 24, 1927. Lifting rings 3 and foot pieces 4 may be provided, and secured to the end rings are bracket members or bracket rings 5. An advantageous assembly for this purpose may be had by a rebate on the margin of the end frame ring 2, and a coacting rebate on the ring 5. The rings 5 are formed of structural steel stock, angle steel, or channel stock, preferably the former, a length being cut and beveled at the ends 6 as shown in Fig. 2, and by now bending the piece into circular form and bringing the ends 6 together in abutment, a ring shaped piece is had, the seam at the faces 6 being completed by welding, as for instance by an arc pencil of suitable metal. These bracket rings thus present the form of a centrally directed flange and a peripheral cylindrical portion. If the stock employed be undesirably sharp-cornered, the metal may be rounded off at this oint by grinding or other suitable manner as desired. After the angle iron has thus been bent to circular form and its ends welded together, a central bear ing-supporting ring 7 is positioned coaxially within such ring, and buttress-legs 8 are secured between the respective ring members. Such buttress-legs preferably are flanged as at 9, the flange tapering oil, and when positioned with the flanges adjacent the bearingsupporting ring, the leg may be welded thereto by a butt seam, while the other end of each leg may be applied to the centrally directed flange of the bracket ring and is welded thereto. This assembly of bracket ring, bearing-supporting ring and buttress legs thus constitute an end unit for assembly in turn withthe end rings of the stator frame.

A circular guard plate 10 may be secured to the centrally directed flange of the bracket ring, and a funnel-shaped extension 11 is ordinarily desirably arranged in conjunction with such guard plate. By the provision of suitable ventilating openings 12 in the frame rings, it will thus be seen that an active circulation is facilitated through the windings of the machine, air being drawn in through the central funnel-shaped opening axially, and thence passing over the windings and ultimately by centrifugal action being discharged through the peripheral openings 12.

The detail of the buttress-legs 8 may vary somewhat, but advantageously a stamped up form providing the flanges 9 and flat projcction 13 is preferable. In some instances however, the form may be simplified or further complicated as preferred.

The bearing-supporting rings 7 as will be readily understood, receive the shaft bearings ll, these being of any preferred tyne, plain or ball bearing, and with elements all in assembly and tied together by a suitable number of tie bolts passing through openings as at 15 in the bracket rings, the entire structure is held together in a manner at once compact and secure, and it will be noticed that by virtue of the arrangement of elements and the means of their fastening together, there results a construction presenting a minimum of metal to interfere with proper cooling, and a minimum of obstruction to interfere with adequate ventilation, while at the same time a marked rigidity and simplicity of assemblage is secured.

Other modes of applying the principle of the invention may be employed, c iange being made as regards the details disclosed, provided the means stated in any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and dis-' tinctly claim as my invention 1. In a dynamo-electric machine, the combination with an annular laminated stator core with which a rotor is to be associated; of end rings abutting said stator core; and substantially distortionless means for supporting bearings for the rotor, said means comprising bracket-rings of structural steel stock joint-welded in a circle and secured to the end rings, a central bearing-supporting ring axially positioned within each said bracket-ring, and buttress-legs joining each bearing-supporting rin and corresponding bracket-ring.

2. In a dynamo-electric machine, the combination with an annular laminated stator core with which a rotor is to be associated; of end rings abutting said stator core; and substantially distortionless means for supporting bearings for the rotor, said means comprising bracket-rings of structural steel stock jointwelded in a circle and secured to the end rings, a central bearing-supporting ring positioned coaxially with respect to the rotor and buttress-legs welded to each bearing-supporting ring and corresponding bracket-ring.

3. In a dynamo-electric machine, the combination with an annular laminated stator core with which a rotor is to be associated; of end rings each having a flange abutting said stator core and a cylindrical portion extending axially therefrom; and substantially distortionless means for supporting bearings for the rotor, said means comprising bracket rings of angle steel stock joint-welded to a circular form with a centrally-directed flange im'a and secured to each such cylindrical portion, a central bearingsupporting ring positioned co-axially with respect to the rotor, and buttress legs joining each bearing-supporting ring and corresponding b1-aclret-ring.

4. In a dynamo-electric machine, the combination with an annular laminated stator core with which a rotor is to be associated; of end rings each having a flange abutting said stator core and acylindrical portion extending axially; a bracket-ring secured to each such cylindrical portion and being of structural steel stock joint-welded in a circle; a central bearing-supporting ring positioned coaXially with respect to the rotor; and buttress-legs welded to the periphery of each bearing-sup porting ring and welded by a flat lap to the centrally directed flange of the corresponding bracket-ring.

5. In a dynamo-electric machine, the combination with an annular laminated stator core with which a rotor is to be associated; of end rings each having a flange abutting said stator core and a cylindrical portion extending axially therefrom, said cylindrical portion having a shoulder; bracket-rings each having a shoulder and adapted to fit the corresponding portion of the end rings, said bracket-rings being of structural steel stock joint-welded in a circle; central bearing-supportingrings positioned eoaxially with respect to the rotor; and buttress-legs joining each bearing-supporting ring and corresponding bracket-ring.

6. In a dynamo-electric machine, the combination with an annular laminated stator core with which a rotor is to be associated; of end rings each having a flange abutting said stator core and acylindrical portion extending axially therefrom; bracket-rings secured to such cylindrical portions respectively, said bracket-rings being of structural steel stock joint-welded in a circle; central bearing-supporting rings positioned coaxiallv with respect to said bracket-rings; buttresslegs joining each bearingsupporting ring and corresponding bracket-ring; a circular guard plate secured to the flange of each bracket- 'ring, and a funnel-shaped extension directed inwardly therefrom.

Signed by me this 20th day of June, 1927.

WILLIAM LA VIGNA. 

